"So, in a situation where Sasuke is back, these unresolved issues would come out completely, strongly, deeply, in a way that Kakashi himself wouldn’t expect. They’d come out unprompted, triggered by something Sasuke said or did, and they’d make Kakashi, usually guarded, composed, kinda aloof, act without thinking, unexpectedly."
Ohh! I'd love to read that! If you ever want to write it, that is. Do you have some headcanons in that setting? They don't have to be exactly about Kakashi's triggers, whatever you feel like sharing.
I have some, as KS is one of the ‘bedtime stories’, more like movies, I more often play in my head tbh.
(putting it under readmore. pls don’t take this as yours, I might write a fic out of it in my time, not rushing)
One it’s about Konoha retrieving Sasuke after Itachi’s death, and a reluctant Kakashi being assigned to guard him. It’s a bit dark as Sasuke’s mind is totally focused on the fight and he has questions about his brother that no one can help him with, since Obito didn’t get to him.
This specific one you mention instead, has a post ending setting. After the war Sasuke is put in jail and even once he’s released, part of his chakra is sealed and so will stay for some time, until he’s not considered a threat anymore. He is pardoned but not allowed to live unsupervised, thus Kakashi becomes his guardian. He is not Hokage, or not yet, idk when he replaced Tsunade in canon tho.
Sasuke moves in Kakashi’s house. He sleeps in the sofa and helps him with chores. He only has a few belongings, the clothes he wore in Shinden and the few ones he’s given. He’s aloof, very silent and quite obedient -he was imprisoned and tamed into submission after all.
N*ruto and S*kura visit him or take him out at times but he doesn’t seem comfortable with them. At least not like he seems with Kakashi, who doesn’t talk much, whose house seems in order at a first glance, but opening cabinets it’s a different impression, so Sasuke has something to do when the elder has to work. Besides, Kakashi can summon dogs and Sasuke likes animals.
Sasuke is reserved, he doesn’t usually talk first, but when asked he replies sincerely to every kind of question. About his brother, of whom he’s always happy to talk about. About his mistakes, of which he’s ashamed of, having been taught how wrong they were. About the things he saw during his journey. And about his time with Orochimaru. The time he ditched his own sensei, the one who taught him the jutsu he created, the one with whom he shared an element affinity, as well as a deeper affinity, being both aloof and silent.
When Sasuke left the village Kakashi didn’t let it affect him, also because he had lost his precious people way before that, and even though he was fond of the youngest Uchiha, he told himself that the boy was doomed, for he hadn’t been able to overcome his need of revenge. Not that he hadn’t tried putting him on the right path, which was staying in the village, focusing on his duties, because only if he exhausted himself with work he would have been able to sleep, maybe, while everything else would have made him think and replay over and over the painful events from the past, which would have inspired future plans. For him working hard and sticking to the rules had worked, that’s why he insisted with his pupil, even though his favourite student didn’t listen to him.
Even though his favourite student joined Orochimaru, from whom he learned forbidden techniques and took poisons and drugs, to whom he gave his body. In more than one way. Kakashi knows because Sasuke told him, matter-of-factly, casually, just because such information fit as a reply to a question the elder asked.
This piece of information first is just a passing cloud in the Copy Ninja’s mind, but it gets heavier every day. The Uchiha is nonchalant about it, he still seems innocent despite having done things with the sannin. Kakashi is not a prude, and he reminds himself that he shouldn’t judge as kunoichi and shinobi are often assigned to missions where they have to distract a target seducing them or letting them do things to them. Yet he’s bothered, because it wasn’t a mission, it lasted for 3 years, and even more so, the boy ditched him, his teachings, his loyalty to the village, his very self, and followed a mad scientist, a pervert, a traitor, to whom he gave everything, from his mind to his body.
This thought gets heavier and harder to keep inside, even for an untalkative person like him, so it seeps out occasionally, usually as snide remarks that the younger doesn’t react to -Kakashi is not sure of he doesn’t get them or if he doesn’t mind, having been taught, while he was sealed in a cell and after, how wrong his actions had been.
Usually.
One time though, Kakashi’s bitter comment Sasuke talks back. He just remarks something, for the sake of accuracy, but the elder doesn’t expect it, because, even if the boy always had a sharp tongue, he hadn’t used it since he was out of jail.
The copy ninja doesn’t expect that his body moves on its own, his hand grabbing the boy’s throat, his arm showing him against the wall, his fingers not loosening, in fact taking strength from his whole body, to keep the other pinned.
Sasuke coughs a little, looking at his former sensei with his eyes wide in surprise. He doesn’t seem scared though; while the elder is tense and confused he’s curious.
“You’re angry...you want to punish me...” He whispers, for the other didn’t loosen his grip yet.
"Konoha punished you already,” The elder cuts short, but the other continues, his tone tentative, as if he’s trying to understand. And he’s succeeding.
“But you didn’t...” he whispers again, eyes peeking through his bangs.
“Do it...I don’t mind,“ his voice is a bit more audible now, as Kakashi’s grip is less tight now, the silver haired man’s usually quick mind hardly processing what he’s hearing -his subconscious hidden fears and desires wanting to come out yet at the same time fighting against his strained willpower.
“Do it,” Sasuke repeats, “I deserve it from you..."
When he swallows, after he’s done speaking, a shiver reaches Kakashi’s spine. He doesn’t expect his body -more specifically, his fist- to move on its own, again.
